Rotary screen



J. J. NEWMAN.

(No Model.) 3 Sheets-Sheet 1.

ROTARY SCREEN.

No. 546,899. PatentedSept. 24, 1895.

INVENTOH Jb7zza Jfjlewmara/ BY A 9 ATTORNEYS.

(No Model.) 3 Sheets-Sheet 2v J. J. NEWMAN.

ROTARY SCREEN.

Patented Sept. 24, 1895.

I INVENTOH 0%7 JJVew/mm A A TTORNEYS.

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(Nd Moiei.) 3 Sheets-Sheet 3 J. J. NEWMAN.

ROTARY $GRBEN.

No. 546,899. Patented Sept. 24, 1895.

INVENTOR i074 n J JVa/m/L 4 BY M 6 ATTORNEYS M. PHOTO-UTHQWASHINGIDN.D.C.

Nrrn STATES- A'rnivr amen.

JOHN J. NEWMAN, OF ELKHART, INDIANA.

ROTARY SCREEN.

SPECIFICATION forming part of Letters Patent No. 546,899, datedSeptember 24, 1895.

Application filed June 8, 1895 Serial No. 552,082. (No model.)

.To all whom it may concern: I I

Be it known that I, J our: J. NEWMAN, re: siding at Elkhart, in thecounty of Elkhart and State of Indiana, have invented a new and ImprovedRotary Screen, of which the following is a specification.

My invention is in the nature of an improved machine for screening sand,cement, plaster-of-paris, bone-dust, and other similar material, and itprimarily has for its object to provide a' machine of this character ofa simple and inexpensive construction, which can be easily manipulated,and which will offectively serve for its intended purposes.

My invention also has for its object to provide a screeningmaehine ofthe character stated having a combined rotary and vibratory motion ofsuch a nature that the material will be subjected to a combinedcentrifugal and irregular vibratory action and be thereby thoroughly andpositively separated in a minimum amount of time.

A further object of my invention is to provide a rotary screen havingthe screen so attached that it can be quickly adjusted from the outsidewithout disconnecting the several parts of the machine, and in which thesaid screen is secured by simple fastening means, which can be readilyadjusted when it is desired to replace aworn screen by a new one.

Nith other objects in view, which will hereinafter be referred to, myinvention consists in the peculiar combination and novel arrangement ofparts, such as will be first described in detail, and then specificallypointed out in the appended claims, reference being had to theaccompanying drawings, in which Figure 1 is a perspective view of myimproved screening-machine as set for actual use. Fig. 2 is a plan viewof the lower or bed portion of the machine. Fig. 3 is an invertedplanview of the rotary-screen carrier and the hood or casing, thefriction-balls being shown in position in the corrugated or ratchet-likeslide or bearing face. Fig. 4 is a vertical longitudinal section of thecomplete machine; and Fig. 5 is a partial side elevation, the door orslide in the casing being raised to the more clearly illustrate theinterior construction.

Referring to the accompanying drawings, in which like numerals indicatecorresponding parts in all the figures, 1 indicates a cir cularbed-plate, which is bolted or otherwise secured to bed-timbers15, whichare suitably mounted on the leg or supporting members 30 30, as mostclearly shown in Fig. 4. This bed-plate has its upper face formed with aratchet-like trackway upon which are held friction balls orrollers 4-,which are held in position by the pendent flanges 25 of the top plate 2,which is also provided on its under face with a ratchet-bearing face,the teeth of which, however, incline in adirection similar to the teethon the bed-plate, as shown most clearly in Fig. 5, such upper and lowerratchetfaces and the balls at being relatively of such a size that thesaid ratchet-faces will be held from engaging each other. The upperplate 2 is also circular, and is connected to a spider-frame 3, securedto the lower end of the driveshaft 9, the upper end of which is guidedin a cross-timber 26 and has secured on its upper end alarge drive-gear27, the hub of which has antifriction-balls 22, which rest on the timber26, such gear 27 meshing with the gear 28 on the main or drive shaft 29.

By referring more particularly to Figs. 2 and 4, it will be seenoutwardly-extending bracket members 5 are secured to main or bed timbers15, which terminate at the outer ends in upwardly-extending flanges 50.These brackets form the support for the hood or casing 6,-the lowerportion of which is formed with vertical sides 60, while the upperportion is coneshaped and terminates in an outwardly-flared mouth orhopper 20, below which, on the interior of the said hood, is formed abreaker 13, the contracted mouth of which is centrally over the screen,for a purpose presently described.

7 indicates a receiving-hopper disposed under the screen, the lower endof which has a gate or slide member 16, adapted when fitted in place toclose the discharge-mouth 17 of the said hopper.

8 indicates aslide-gate formed in the vertical wall of the hood orcasing 6, which when raised allows free access to the screen andscreen-clamping devices without removing the said hood.

14 indicates a trough which surrounds the timber 15 and is disposedunder the opening 21 to catch the rough or coarse material thrown off bythe screen, such trough in the practical construction havinga sufficientfall or slant to convey the material to the door or a bin arranged toreceive it, as indicated by dotted lines in Fig. at.

By supporting the hood in the manner described and shown, the same willremain stationary as the screen is revolved, and as the vertical sidesfit against the outer or upturned ends of the brackets a circular space21 is provided, the purpose of which will also presently appear.

1Gindicates the screen-body, which extends entirely over the internalspace between the bed-plates 1 and 2, the outer ends thereof beinglapped onto the upper face of the plate 2, where it (the body) issecured by a clampplate 19, which may be formed of a single circularplate or a series of plates, which may be secured to the top plate 2 byset-screws or otherwise.

The screen-cloth is centrally held by fitting over the shaft 9 andclamped between the plates 11, which are tightened by means of the nuts12 12, as clearly shown.

The manner in which my improved screening-machine operates is bestdescribed as follows: The material to be screened is dumped into thehopper-top of the hood 6, and as it falls engages the breaker 13, whichserves to collect, guide, and discharge it centrally onto the screen.The screen revolving will serve, by centrifugal action and the slantthereof from the center outward, to move the larger or coarse particlesto the periphery of the screen, over the edges thereof and through thespace 21 into the trough 14, from which such coarse stuff will pass ontothe floor or into a bin arranged to receive it. \Vhile the material isthus treated by the centrifugal action of the screen a quick dischargeof the coarse material is arrested by the continuous vertical vibrationsimparted to the screen by the ratchet-like bearing-faces, which serve toeffectively separate the liner from the coarse particles before suchcoarse particles are discharged from the screen. By providing ratchetbearing-faces and intermediate antifriction-balls, arranged as shown, itwill be manifest I obtain all the advantages of the vibratorymovementsincident to the travel of one ratchet-face over the other witha minimum amount of friction and prac-.

plate moves in the direction indicated by arrow in Fig. 5, the balls, asthey are brought against the vertical faces of the lower ratchet, willserve to producea jar on the rotary screen provided by the, as it were,momentary stoppage of the screen before the said upper ratchet rises upover the ball to produce the vertical vibration. The screen thusreceives, as it is rotated, a wave-like motion, a constant series ofsudden jars and vertical vibrations, thereby positively separating allthe finer grade of the material from the coarse or rough stuff. Thescreened material, as it passes into the hopper 7, can escape into abarrel, as shown, or other receptacle. Then one barrel is filled, thegate 16 is pushed in place to close the discharge-mouth 17, while thefilled barrel is removed and an empty one is brought into position.

From the foregoing description, taken in connection with theaccompanying drawings, it is thought the complete operation and theadvantages of my invention will be readily apparent to those skilled inthe art to which it appertains. It will be noticed the top or casing canbe easily lifted, as also the spiderframe, the screen, and thedrive-shaft 9. Furthermore, as the casing is conical in shape and heldto project down lower than the screen, and as it has an inverted conicalinternal breaker, the machine will be practically dustless.

By connecting the screen-body in the manner stated when it is desired toput in a new screen it is only necessary to raise casing 6, loosen clamp19, remove lower clamp and nut 11 and 12, raise shaft 9 (which has asquare end) from spider and pull out the worn screen. The new screen isthen slipped over the end of the shaft and clamped there to the lowerclamp and nut. The shaft is then fitted back into the spider-frame andthe ends of the screen secured by the clamps 19.

The screen can be tightened or be set to have its center elevated moreor less above its outer edges by adjusting the clamps 11 and nuts 12 onthe threaded-end shaft 9, as will be obviously understood by referringto Fig. 4 of the drawings.

Having thus described my invention, what I claim, and desire to secureby Letters Iatcut, is

1. A screening machine comprising a fixed bed having ratchet guide orbearing por tions a revolving screen body having similar ratchet likebearing portions held to travel over the bed ratchet portions andintervening anti friction balls engaging such ratchet bearings and meansfor revolving the screen body substantially as and for the purposesdescribed.

2. A screening mechanism comprising a fixed bed having ratchet likeguide or bearing portions, and a screen body revolving upon the said bedhaving ratchet like bearing portions arranged to oppose the bed ratchetssuch ratchets being arranged to have their straight faces oppose eachother, and anti friction balls held between such ratchet faces, allarranged substantially as shown and described.

3. In a rotary screen, the combination with a fixed or bed guide havinga circular ratchet face, ball bearings held thereon and a rotary screenbody having a circular ratchet bearing face adapted to rest on the saidballs and having pendent flanges adapted to hold the balls in placebetween the said ratchet faces as specified.

4. In a rotary screen the combination with the circular bed havingratchet teeth of the surrounding trough, the hood or cover carrying ahopper, the revolving screen having an outer rim provided with ratchetteeth upon the under side thereof, the interposed antifriction ballsbetween the two ratchet faces and means for revolving said screensubstantially as shown and described.

5. As an improvement in rotary screens, the combination with a circularbed frame and a screen body held to rotate on the circular frame havingvertically extending drive shaft, said bed frame having laterallyextending brackets and spaced apart from the circular bed frame, thehood supported by said brackets said hood having its upper portion coneshaped and terminating in a hopper like mouth, and a trough orcollecting member secured to the bed frame and extended under the spacebetween the bed frame and the hood as set forth.

6. The combination with the bed frame, the rotary screen having a screenbody inclined down from the center to the periphery a drive shaftconnected therewith extending upward, the clamp devices for securing thescreen, and the trough 14 all arranged substantially as shown, of thehood 6 having a straight portion 60 held over the trough 14 and bedframe, said portion 60 having a slide door, the upper end of which hoodbeing conical and terminating in a hopper like mouth, and having aninverted cone shaped breaker on the inside below such mouth as setforth.

7. The combination with the ratchet bed plate 1, the frame 15, thehopper 7, the balls 4, the trough 14, and brackets 5 all arrangedsubstantially as shown, of the spider frame 3, having an annular ratchetbearing plate 2, adapted to rest on the balls 4, the clamps 19, theshaft 9, the clamp nuts 11 and 12 the screen body 10 held thereby, andthe hood 6 held on the brackets 5, having a conical upper endterminating in a hopper mouth, and provided with a breaker 13, asdescribed and for the purposes set forth.

JOHN J. NEWMAN.

WVitnesses:

JAMES H. STATE, ELLIOTT CRULL,

